TY - JOUR
T1 - Limitations encountered for the treatment of a low C:N waste using a modified membrane-aerated biofilm reactor
AU - Landes, Nicholas C.
AU - Jackson, W. Andrew
AU - Morse, Audra N.
PY - 2011/2
Y1 - 2011/2
N2 - A modified membrane-aerated biofilm reactor (mMABR) that combined oxygen permeable membranes and inert attachment media to support both nitrification and denitrification was used to treat a carbon-limited (COD:N 5 1.8) and ammonium-rich (NH4+ 5 650 g-N/m3) space habitation waste stream. An eight-fold increase in intramembrane air pressure did not affect process performance; however, for an air pressure of 11 kPa (gauge), lower and upper hydraulic loading limits for the mMABR were identified at 30 g-N/m3·d and 123 g-N/m3·d, respectively. Oxygen limitation occurred at the highest loading rate and alkalinity limitation occurred at the lowest loading rate. Partial nitrification was noted at both limitations. Additionally, increased recirculation ratios were shown to decrease denitrification efficiency. Mean carbon and nitrogen removal rates were as high as 75.3 g-C/m3·d (0.26 g-C/m 2·d) and 63.8 g-N/m3·d (0.22 g-N/m 2·d), respectively. The mMABR achieved maximal nitrification and denitrification performance given the stoichiometric nature of the waste.
AB - A modified membrane-aerated biofilm reactor (mMABR) that combined oxygen permeable membranes and inert attachment media to support both nitrification and denitrification was used to treat a carbon-limited (COD:N 5 1.8) and ammonium-rich (NH4+ 5 650 g-N/m3) space habitation waste stream. An eight-fold increase in intramembrane air pressure did not affect process performance; however, for an air pressure of 11 kPa (gauge), lower and upper hydraulic loading limits for the mMABR were identified at 30 g-N/m3·d and 123 g-N/m3·d, respectively. Oxygen limitation occurred at the highest loading rate and alkalinity limitation occurred at the lowest loading rate. Partial nitrification was noted at both limitations. Additionally, increased recirculation ratios were shown to decrease denitrification efficiency. Mean carbon and nitrogen removal rates were as high as 75.3 g-C/m3·d (0.26 g-C/m 2·d) and 63.8 g-N/m3·d (0.22 g-N/m 2·d), respectively. The mMABR achieved maximal nitrification and denitrification performance given the stoichiometric nature of the waste.
KW - Hybrid reactor
KW - Low C/N waste
KW - Membrane-aerated biofilm reactor
KW - Partial nitrification
KW - Simultaneous nitrification/denitrification
UR - http://www.scopus.com/inward/record.url?scp=79954479175&partnerID=8YFLogxK
U2 - 10.2175/106143010X12780288628138
DO - 10.2175/106143010X12780288628138
M3 - Article
C2 - 21449474
AN - SCOPUS:79954479175
VL - 83
SP - 128
EP - 139
JO - Water Environment Research
JF - Water Environment Research
SN - 1061-4303
IS - 2
ER -